Synthesis of 2′-deoxy-2′-fluororibo- and 2′-deoxy-2′,2′-difluororibonucleosides derived from 6-(het)aryl-7-deazapurines
作者:Pavla Perlíková、Neus Jornet Martínez、Lenka Slavětínská、Michal Hocek
DOI:10.1016/j.tet.2012.07.033
日期:2012.9
protection of 3′- and 5′-hydroxyls by acid-labile groups followed by stereoselective SN2 fluorination and deprotection. The difluororibo-series was prepared by non-stereoselective glycosidation of 6-chloro-7-deazapurine with benzoyl-protected 2-deoxy-2,2-difluoro-d-erythro-pentofuranosyl-1-mesylate followed by cross-couplings, separation of anomers and deprotection. The title nucleosides did not show considerable
在位置上具有芳基或杂芳基的抑制细胞生长的6-hetaryl-7-deazapurine核糖核苷(2'-deoxy-2'-fluororibo-和2'-deoxy-2',2-difluororibonucleosides)的一系列新型糖修饰的衍生物制备6,并筛选其生物活性。氟代核糖衍生物是通过相应的6-氯-7-脱氮嘌呤2'-脱氧-2'-氟核糖核苷11与(杂)芳基硼酸的钯水溶液催化交叉偶联反应制得的。关键中间体11,随后通过立体选择性S为从由酸不稳定基团的3'-和5'-羟基选择性保护相应的阿糖制备通过六步序列Ñ2氟化和脱保护。所述difluororibo系列的制备是通过将6-氯-7-脱氮嘌呤的非立体选择性糖苷化与苯甲酰保护的2-脱氧-2,2-二氟d -赤-pentofuranosyl -1-甲磺酸酯,随后交叉耦合,分离异构体和脱保护。标题核苷没有显示出明显的细胞抑制或抗病毒活性。